Motor



March 10, 1931. VE 1,796,008

MOTOR Filed March 26. 1925 s Sheets-Sheet 2 Claude fire W: Z

MWLWL WW C. DREVET March 10, 1931.

MOTOR Filed March 26. 1925 5 Sheets-Sheet 3 678a (Z6 firm/e i Patented Mar. 10, 1931 I PATENT OFFICE cmu'na nnnvar, or rams, amen Io'ror.

Application fled larch 28, 1925, Serial No. 18,613, and in France April 4, 1924.

The present invention relates to a motor operating with steam or other fluid under pressure, of the t e in which the fluid is admitted between t e internal surface of :1 cyl- 5 inder rotatably mounted on a stationary shaft and the external surface of a second cylinder rotatin on a second stationary shaft parallel to the rst-mentioned shaft, the said cylinders being adapted to remain tangent along a fixed line, whereas the crescent shaped s ace between the cylinders is divided by a sli ing plate into two spaces of which the capacity increases and decreases alternately from zero to a maximum during each revolution of the 15 said plate which is actuated by the cylinders.

My invention contemplates a device for variable expansion as well as suitable reversing means, and possesses the following advantages.

First: None of the parts serving for the fluid-tight construction are free from movements of transmission, stresses or reactions. Said parts operate freely, and their normal wear as well as the effects of expansion are automatically compensated.

Second: The internal cylinder acts solely as a separator, not a transmitter, i. e. the se arating plate is slidable in a slot in the said cylinder without subjecting the guiding means to any reaction due to the pressure. The said plate is preferably pivotally mounted on the external cylinder and may be guided by a rocker bearin on the internal cylinder.

Third:- Both cy 'nders are mounted upon ball or roller bearin Fourth: A plurality of internal cylinders are movable within a common external cylinder and the corresponding plates are spaced atsuitable angles whereby all dead centre is iibvated and the engine can be started at full Fifth: The steam inlet can be regulated at will and is also subjected to the action of a centrifugal governor in such manner that the expansion is proportional to the load, from.

whence results a very constant speed irrespective of load variation.

Sixth; The steam is admitted to the admission ports through the stationary shaft which is of a hollow construction, which allows easy control of the distribution elements from the exterior and the checking of their positions by experiment for various angular Seventh: All the operating elements for the control of the circulation of the power fluid, for regulating the admission and expansion, the speed and power, for reversing the direction of running, and for re lating the lubrication, are placed together in a convenient position upon one side of the ma chine;

Eighth: Reciprocating motion is entirely eliminated, and the driving elements, which are in opposition as to power and weight, balance each other, thus allowing high speeds to be obtained without jarring.

Ninth: The so-called motor is rotatably mounted within a stationary casing which is filled with the exhaust steam and which may be connected with a condenser.

Tenth: Lubrication can be carried out by a single oiler feeding on the one hand into the steam inlet and on the other hand into the oil ducts leading to the parts exposed to friction or to the bearings.

The appended drawings show by way of example a constructional form of a motor according to the invention comprisin two internal cylinders provided with s lding plates spaced at 180.

Fig. 1 is an axial section of the said motor; and

Figs. 2 and 3 are sections respectively on the lines 2-2 and 3-3 of Fig. 1.

1 is the external cylinder which is provided with a middle partition 2 separating the two internal cylinders 3 and 4. The latter are mounted in eccentric position upon the sta tionary crank-shaft 5 and rotate in the ballbearings 28 and 29. This aggregate is dlsposed in a stationary casing 6 forming a frame and provided with two heads 7 and 8. The said crankshaft is keyed in a permanent manner to the head 8 and has mounted thereon the eccentrics 46 and 47 upon which are respectively revoluble the cylinders 3 and 4. Within the said casing is an exhaust orifice 23 in which may be able valves 13 and 14 serving to regulate the distribution. To the housin 52 is secured the driving shaft 11 provided with a pulley 12, for example, and rotating in a ball-bearing 33. Under the combined action of a centrifugal regulator 25 and a reaction tion, and in One of the tubular shaft 15 spring 19, the valves 13 and 14 may be given a longitudinal displacement when the motor is running. The periphery of each of the 'said' valves is bounded by a helical ramp in order to close the admission ports 48, 49 during a greater or less portion of each revoluproportion to the work required. said valves operates during forward running and the other during reverse 7 running of the engine.

Since the steam is best utilized by its admission into the motor at the boiler pressure, calculations for the adjustment for a' given power show that the steam is to be admitted during a certain angle of rotation Whereas the remainder of the stroke is employed for expansion, in such manner that exhaust takes place at a pressure which is near atmospheric pressure.

To change the direction of mi ning, I utilize a distributing element 50 which may be rotated by a hand wheel 16 mounted on a in which is slidable the rod 17 having thereon the valves 13 and 14 and ending in a lever 18 opposed by the action of the spring 19. Said spring is mounted on a rod 20 upon which is screwed the s ringregulating nut 21, said nut being gra uated by experiment and serving to control the disp acement of the tumblers instigated by the governor 25. s

The said governor is provided with a movable rod 24 provided with a shoulder cooperating with the ball-levers. Said rod is preferably provided with longitudinal grooves whereby all effect of the steam pressure is obviated. A hand wheel 27 controls a valve 26 for closing the steam inlet, for example when the motor is reversed. On the end of the shaft 5 is disposed a metallic stuffing-box arrangement 32 comprising a ring provided with a collar which latter is in contact with the surface of the end portion 9. To prevent an excessive bearing surface which might cause an adhesion capable of rotating the said ring upon the stationary crankshaft, suitable balls whose diameter is equal to the depth of the recess containing the same are interposed between the said plug 39 is screwed on,

collar and the end surface. The square packing rin ensures fluidtightness, so that the speed 0 rotation of the whole' becomes diminished. It should be observed that the known types of stufling box' cannot be employed, as the packing would require a frequent removal.

The steam inlet is controlled by a gate valve 34. The motor is provided with the sight-feed oilers 35, 36 of which the first serves to supply oil to the current of steam. and the second to lubricate the ball-bearings of the internal cylinders through the ducts 42, 43. The oil is contained in the tank 37 which is placed under pressure through a tube 38 having a check valve at the top. Said valve is lowered and opens when the and closes automatically before the said plug is entirely removed, so that the device can be filled during the running. The cock 40 serves to evacuate'any condensate produced in the tank 37.

The plates 55, 56 are pivotedto the cylinder l and are slidably mounted in the rockers 57 58 mounted on the cylinders 3, 4 and enabled to oscillate thereon. Steam is admitted through the conduits 51, 53, 54, 59

conduits corresponds to a given direction of.

running. The exhaust takes the same conduits when the p I the recesses 60, 61 of the distributor which connects them with the interior of the engine casing through the apertures 62, 63 of the housing 52.

place through the gate valve will now predevice which is alew seconds. i The outcome opposite The operation is as follows. With the lets at 35. and 36 are regulated, and the valve 26'is then slowly opened. The condensed water is circulated along with the steam through the conduits and into the motor cylinders, and the motor will start at once, even when cold. N o inconvenience is to be apprehended from theefiects of the condensa tion at the start, as the evacuation can always take place through the exhaust which is constantly open.

The steam entering through'the hollow shaft 5 into the said valves will flow through one or the other of the ports 48, 49 into the conduits 59, 51 for one direction of running or into the conduits 54, 53 for the opposite direction. This admission begins at the instant at which the late 55 or 56 passes the point of tangency of the two cylinders and is cut off at a later point according to the position of the said discs.

fter expansion, the steam can escape at the other side of the plate through the conduits 53 and 54 for forward running, or through the conduits51 and 59 for reverse running, and with a constant flow, since in each case the respective conduits are constantly connected by the recesses 60 or 61 and the apertures 62 or 63 with the interior of 5 the main casing 6. Since the spring 19 regulates the operating rate for which the engine has been designed, the inlet of steam is automatically limited by the operation of the valves 13, 14:. Inasmuch as the steam expands to the maximum,-a high degree of eificienc will be thus obtained, and this may be furt er increased by connecting the exhaust with a condenser.

Having described my invention what I 15 claim as new and desire to secure by Letters Patent is In a rotary engine of the type described the combination of a hollow fixed shaft, a rotor adapted to rotate concentrically about said shaft, fluid distributing means concentrically dis osed on said rotor, a non-rotatable spira value positioned within said means cooperating therewith, a control rod for said valve extending through said fixed g5 shaft, and means for longitudinally displacing said control rod whereby the point of admission of said means is variable at will.

In testimony whereof I have hereunto affixed my signature. CLAUDE DREVET. 

